Idiom
Which statement regarding the mammalian heart is correct?

In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs
When the right atrium contracts, it forces blood into the left atrium
Blood is pumped from the heart via the atria
Oxygen-loaded blood moves only through the right side of the heart

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Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. To stand to one's guns

To maintain dignified and unbending attitude
To maintain one's position
To persevere when hardships press
To keep the guns close to oneself even amid danger

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